[PATCH] NFSv4: Client-side xdr for writing NFSv4 acls

 Client-side support for NFSv4 acls: xdr encoding and decoding routines for
 writing acls

 Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

3 files changed, 78 insertions, 1 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 6f1c003ee33a..325cd6d4f23a 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -372,6 +372,13 @@ static int nfs_stat_to_errno(int);
                                 decode_putfh_maxsz + \
                                 op_decode_hdr_maxsz + \
                                 nfs4_fattr_bitmap_maxsz + 1)
+#define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
+                                encode_putfh_maxsz + \
+                                op_encode_hdr_maxsz + 4 + \
+                                nfs4_fattr_bitmap_maxsz + 1)
+#define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
+                                decode_putfh_maxsz + \
+                                op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
 
 static struct {
         unsigned int    mode;
@@ -471,7 +478,7 @@ static int encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const s
          * In the worst-case, this would be
          *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
          *          = 36 bytes, plus any contribution from variable-length fields
-         *            such as owner/group/acl's.
+         *            such as owner/group.
          */
         len = 16;
 
@@ -1096,6 +1103,25 @@ static int encode_renew(struct xdr_stream *xdr, const struct nfs4_client *client
 }
 
 static int
+encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg)
+{
+        uint32_t *p;
+
+        RESERVE_SPACE(4+sizeof(zero_stateid.data));
+        WRITE32(OP_SETATTR);
+        WRITEMEM(zero_stateid.data, sizeof(zero_stateid.data));
+        RESERVE_SPACE(2*4);
+        WRITE32(1);
+        WRITE32(FATTR4_WORD0_ACL);
+        if (arg->acl_len % 4)
+                return -EINVAL;
+        RESERVE_SPACE(4);
+        WRITE32(arg->acl_len);
+        xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
+        return 0;
+}
+
+static int
 encode_savefh(struct xdr_stream *xdr)
 {
         uint32_t *p;
@@ -3492,6 +3518,48 @@ out:
 
 }
 
+/*
+ * Encode an SETACL request
+ */
+static int
+nfs4_xdr_enc_setacl(struct rpc_rqst *req, uint32_t *p, struct nfs_setaclargs *args)
+{
+        struct xdr_stream xdr;
+        struct compound_hdr hdr = {
+                .nops   = 2,
+        };
+        int status;
+
+        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+        encode_compound_hdr(&xdr, &hdr);
+        status = encode_putfh(&xdr, args->fh);
+        if (status)
+                goto out;
+        status = encode_setacl(&xdr, args);
+out:
+        return status;
+}
+/*
+ * Decode SETACL response
+ */
+static int
+nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, uint32_t *p, void *res)
+{
+        struct xdr_stream xdr;
+        struct compound_hdr hdr;
+        int status;
+
+        xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
+        status = decode_compound_hdr(&xdr, &hdr);
+        if (status)
+                goto out;
+        status = decode_putfh(&xdr);
+        if (status)
+                goto out;
+        status = decode_setattr(&xdr, res);
+out:
+        return status;
+}
 
 /*
  * Decode GETACL response
@@ -4117,6 +4185,7 @@ struct rpc_procinfo	nfs4_procedures[] = {
   PROC(SERVER_CAPS,     enc_server_caps, dec_server_caps),
   PROC(DELEGRETURN,     enc_delegreturn, dec_delegreturn),
   PROC(GETACL,          enc_getacl,     dec_getacl),
+  PROC(SETACL,          enc_setacl,     dec_setacl),
 };
 
 struct rpc_version              nfs_version4 = {
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 6ee7e2585af5..5bb5b2fd7ba2 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -383,6 +383,7 @@ enum {
         NFSPROC4_CLNT_SERVER_CAPS,
         NFSPROC4_CLNT_DELEGRETURN,
         NFSPROC4_CLNT_GETACL,
+        NFSPROC4_CLNT_SETACL,
 };
 
 #endif
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 9f5e1d407c7b..46b206b460c0 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -326,6 +326,13 @@ struct nfs_setattrargs {
         const u32 *                     bitmask;
 };
 
+struct nfs_setaclargs {
+        struct nfs_fh *                 fh;
+        size_t                          acl_len;
+        unsigned int                    acl_pgbase;
+        struct page **                  acl_pages;
+};
+
 struct nfs_getaclargs {
         struct nfs_fh *                 fh;
         size_t                          acl_len;